RCBS AmmoMaster/ Piggyback Shell Plate #18

The RCBS AmmoMaster Piggyback Shell Plate #18 is a precision reloading component engineered to center ammunition cases with critical accuracy during the cartridge reloading cycle. Part of RCBS's modular shell plate system, the #18 plate corresponds to specific cartridge families and ensures consistent case alignment across all five station positions of the reloading press, directly impacting the uniformity and safety of finished ammunition.

Shell plates function as the dimensional interface between the cartridge case and the reloading dies. Proper alignment prevents case runout, ensures concentric bullet seating, and reduces variability in powder charges and primer seating depth. The shell plate design accommodates the case head dimensions of its designated cartridge family, meaning the #18 specification is caliber-specific. Reloaders must verify their cartridge's shell plate number before purchasing to avoid press compatibility issues and substandard ammunition production.

This component is essential for shooters operating RCBS progressive or single-stage presses with five-station capability who demand consistency in handloaded rifle or pistol ammunition. Whether preparing match-grade loads for precision rifle work, high-volume tactical training ammunition, or hunting cartridges, accurate case centering is non-negotiable for reliability and performance. The shell plate's compact design and lightweight construction (0.34 lbs) make it simple to swap when transitioning between different cartridge types on the same press platform.

RCBS shell plates remain the industry standard for progressive reloading press systems due to tight manufacturing tolerances and consistent fit across their product lineup. Operators familiar with RCBS equipment will recognize the #18 plate as a direct replacement or upgrade component, ensuring seamless integration without press modification.